Jawab:
Penjelasan dengan langkah-langkah:
bangun ruang
Luas permukaan = LP
___
soal 3
bola
d= 20 , r = 10
LP bola = 4π r²
LP bola = 4 x 3.14 x 10² = 1.256 cm²
soal 4
kerucut
r= 5
t = 12
s= √(t²+r²) = √(12²+5²)= √ 169
s= 13
LP kerucut = π r(r + s)
LP kerucut= π x 5 ( 5 + 13)
LP kerucut= π x 5 x 18
LP kerucut= π x 90 = 282,6 cm²
soal 5
kubus , s kubus = 8
limas , s limas = 8
t segitiga = √(5² - 4²)= √9 = 3
LP = 5s² + 2 s t
LP = 5(8)² + 2 (8)(3)
LP = 320 + 48
LP = 368 cm²
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Jawab:
Penjelasan dengan langkah-langkah:
bangun ruang
Luas permukaan = LP
___
soal 3
bola
d= 20 , r = 10
LP bola = 4π r²
LP bola = 4 x 3.14 x 10² = 1.256 cm²
soal 4
kerucut
r= 5
t = 12
s= √(t²+r²) = √(12²+5²)= √ 169
s= 13
LP kerucut = π r(r + s)
LP kerucut= π x 5 ( 5 + 13)
LP kerucut= π x 5 x 18
LP kerucut= π x 90 = 282,6 cm²
soal 5
kubus , s kubus = 8
limas , s limas = 8
t segitiga = √(5² - 4²)= √9 = 3
LP = 5s² + 2 s t
LP = 5(8)² + 2 (8)(3)
LP = 320 + 48
LP = 368 cm²